Indenting-machine.



L. A. CASGRAIN.

INDENTING MACHINE. APPLICATION FILEb 02c. 3. .1915.

Patented Nov. 21, 1916.

2 SHEETS-SHEET I- L- A. CASGBAIN.

INDENTING MACHINE.

APPLICATION FILED DEC. 3. 1915.

Patented N 0v. 21, 1916.

2 SHEETS-SHEET 2.

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LOUIS A. CAsGEAIN, OE BEVERLY, MASSACHUSETTS, AssIGNoE ro UNITED SHOE MACHINERY COMPANY, OF PATEEsoN, NEW JERSEY, A CORPORATION OF NEW JERSEY.

INDENTING-MACI-IINE.

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Application filed December 3, 1915.

To all whom it may concern:

Be it known that I, LOUIS A. CASGRAIN, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain Improvements in Indenting-Machines, of which the following description, in connec' tion with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in'the several figures.

This invention relates to impression regs ulating means for that class of machines which mark or ornament the surface of leather or other stock by nurling or indenting the surface with a tool.

One construction with which the present invention can be advantageously combined is illustrated in the nurling machine of my United States Letters Patent No. 768,560, of August 23, 1904. In this patented construction a nurling tool of circular form is adapted to roll or travel over the leather or stock to be treated, and while in Contact with the stock, the tool receives rapid percussional impulses in the form of a series of blows imparted to the tool in rapid succession by a revoluble hammer acting upon a carrier for the nurling tool. Preferably, the tool is held in sliding or rolling Contact with the stock being treated, and as the tool travels over the stock the rapid percussional impulses given the tool subject the stock to rapid variations in pressure in the line of contact of the tool with the work, such variations acting to compress the stock acted upon. Such a tool may be used for a variety of purposes, including ornamentation by indentation or nurling, as well as the concealment of disfiguring marks upon the surface of the stock. Such tools are commonly used for indenting the welt and for acting upon the sole of a shoe to conceal the marks of operations onthe shoe sole.

In a tool of this character, means are provided, usually in the form of a spring, which normally tend to hold the tool in contact with the surface of the stock which is held yieldingly pressed against the tool. The tool is supported by a carrier which is mounted to reciprocate in a direction to bring one end in the path of rotation of a revoluble hammer presenting an irregular Specification of Letters Patent.

Patented Nov. 21, 1916.

Serial No. 64,917.

hammer face which is adapted, in the rotation of the hammer, to impart to the end of the carrier-Ya succession of rapid blows or short strokes. A common form of hammer consists of a rotating block having a series of radial rollers sustained on spindles mounted therein, such as disclosed in the patent referred to. The force of the hammer blow imparted to the tool carrier, and consequently the depth of the impression made in the stock, is determined by the de gree to which the end of the carrier projects into the path of the rotating hammer. The degree of compression is thus determined by the length of the percussional stroke iniparted to the carrier by the hammer.

With the various grades of stock used in different shoes, it is evident that to obtain the best results, the stock compressing force of the leather working tool must be varied to suit the different conditions and grades of of the hammer blows. This is accomplished by stop mechanism which serves to vary the length of the hammer strokes by limit- .ing the degree to which the carrier may project into the path of movement of the hammer, the stop mechanism being adjustable to vary the limit of projection.

A further feature of the invention resides ina stop member with means for effecting relatively fine adjustments. In a machine of the type described wherein the stroke of the tool is very slight, a means permitting rela tively fine adjustments in the length of the stroke is a desideratum. In the illustrated embodiment of the invention, the stop member is carried by and free to turn about an eccentric carried by a threaded pin whose rotation, in conjunction with the eccentric, provides for very fine variations in the position of the stop member. The threads of the pin in conjunction with a lock nut provide means for maintaining the stop in the selected adjusted position.

These and other features will be more clearly apparent from the following detailed specification of the invention considered in connection with the accompanying drawings which illustrate an embodiment of my invention, particularly adapted to a nurling machine of the type disclosed in United States Letters Patent No. 768,560, aforesaid. It is to be understood, however, that this embodiment is merely illustrative and is not definitive of the scope of the inv vention.

In the drawings, Figure l is a view in side elevation of a nurling machine of the type disclosed in the patent heretofore referred to, this machine embodying one form of the impression regulating means of the present invention; Fig. 2 is a fragmentary vertical section through the upper part of the machine showing the hammer carrier and its associated parts on an enlarged scale; Fig. 3 is a perspective view of the hammer with its associated regulating means in operative relation to a shoe mounted upon the support, the carrier being broken away to disclose the stroke regulating means upon the interior thereof; and Fig. 4 is a rear elevation of the carrier shown in Figs. 2 and 3.

In the machine illust'ated in the drawings a column 2 is provided for supporting the machine parts, suitable feet 4. being supplied at the base of the column. The upper end of the column is formed with a transverse arm 6 providing a bearing for an operating shaft 8 (Fig. 2) which extends out beyond the arm 6 and carries fast and loose pulleys 10 driven by a belt (not shown) which is operated by a suitable belt shipper 12.

Adjacent to and below one end of the shaft 8 is a leather nurling tool it which may be in the form of a rotary toothed wheel or wheels rotatably mounted upon a spindle at the lower end of a carrier 16 mounted in a face plate 18 detachably secured to one end of the transverse arm or housing 6. The end of shaft 8 projects within this face plate and carries a hammer cage 20 within which are mounted a plurality of radial hammer rollers 22. The carrier 16 is mounted between spaced guiding walls of the face plate 18 for reciproc'at'ory movement in a direction to bring its rounded upper end into the path of rotation of the plurality of hammer rollers 22. T he body of the carrier 16 within the guiding ".1115 of the face plate, is formed on opposite faces with recesses 24: and 26 spaced by an intermediate web portion 28. This web portion is formed at 30 with an elongated aperture therein designed to permit a pin to extend through the web and to permit reciprocation of the carrier relative to the pin which is immovably held in adjusted position in the face plate by means of a threaded head 3-l received in a threaded bore in one wall'of the face plate and having a lock nut 36 mounted thereon and engaging the face plate. The inner end of the pin is journaled in a bearing aperture in the opposite guiding wall of the face plate. The carrier with its nurling tool is normally pressed downwardly in a direction to place its upper end beyond the path of movement of the rotary hammer by a coiled spring 38 seated within the recess 26 of the carrier with its lower end engaging the carrier and with its upper end mounted upon a sleeved washer %O which bears against the pin 32.

The stock to be operated upon, in the present instance illustrated as the sole of a shoe, is adapted to be held by the operator against the spring pressed nurling tool and moved relatively to the tool so that the latter travels over the surface to be marked. Accordingly, a stock support is provided in the form of an arm or horn 12 having its upper end beneath and closely adjacent to the nurling tool and having its lower end clamped to a sleeve 44 rotatably mounted upon the upper end of a treadle-operated rod 46 which extends through and is guided in suitable projections from the column 2 for vertical reciprocating movement toward and from the nurling tool. The lower end of the rod 46 is reduced in diameter and extends through a vertically movable sleeve 50 to the lower end of which sleeve spaced links 52 are connected, these links being in turn connected at their opposite ends to a bell crank treadle lever 54. The upper end of the rode?) above the sleeve 50 carries a hollow weight 56 clamped" thereon and' lower end of which rests upon a tensioning washer 6O adjustably mounted upon the threaded sleeve 50. Obviously, therefore, the stock supported by the arm or horn 42, will be held in yielding engagement with the nurling tool when the treadle 54: is operated to move the sleeve 50 upwardly and through the spring 58 to move the weight 56 and the attached rod 4-6 upwardly. In this type of machine a feed wheel 62 depends from the arm 6 and extends in the plane of the upper end of the horn and closely adjacent to the horn to engage the stock and feed it relatively to the nurling tool.

The upper end of the carrier 16 is normally held out of the path of movement of the rotary hammer by the action of the spring 38. When the stock, such as the shoe shown in Fig. 3, is mounted upon the horn and the treadle 54 is operated, the carrier will be moved upwardly to bring its upper end in the path of rotation of the hammer. The shaft 8 is ordinarily driven at very high speed so that the hammer will impart to the tool carrier a rapid succession of blows or percussive impulses of high frequency. Each blow will impart to the carrier and its tool a short stroke which will cause the stock support to yield slightly under the force of the blow. The reaction from the blow will immediately return the upper end of the carrier into thepath of movement of a succeeding hammer roller. The compression of the spring 58 naturally tends to return the stock in the direction of the hammer. It is necessary to permit relative movement between the stock support and carrier in order that the carrier may move upwardly to receive a short stroke or percussive impulse, and the weight 56 not only prevents undue yielding of the support under the stroke of the hammer, but also on account of its inertia prevents the stock support from rising with the carrier and tool between the rapid consecutive strokes of the hammer on the tool carrier.

The force of the stroke or blow, and the depth of the impression upon the stock is determined by the amount or degree of projection of the upper end of the carrier into the path of movement of the rotary hammer. Regulation of the length of this stroke involves relatively fine adjustment, owing to the relatively short length of the stroke. Both of the recesses 24 and 26 are elongated in the direction of reciprocation of the carrier and in the line of movement of the carrier toward the hammer. In order to provide such a relatively fine adjustment of the carrier movement in the direction of the hammer, I have provided the pin 32 with an eccentric 64 on which an elongated stop member 66 is journaled and free to turn. This member 66 has a length slightly less than the length of the recess 24 and a width less than the width of said recess, the sides of said member being tapering and the ends being rounded. The lower end of this stop member provides an abutment or stop surface engaging the lower end of the recess 24 upon the upward movement of the carrier, and is formed on an arc concentric with the are upon which the bottom of the recess is formed so that whatever the position of adjustment of the stop member, the lower contact surfaces of the carrier and stop member will be automatically centered. A fine adjustment and a relatively wide range of adjustment is provided through the threaded engagement of the head 34 of the adjusting pin in the guide wall of the face plate 18. This adjustment is fixed by means of the lock nut 36. The upper end of the member 66 will act as a stop to limit the downward movement of the carrier by the spring 38 but in the actual nurling operation the upward pressure of the stock against the tool and carrier will ordinarily prevent forcible contact of the hammer driven carrier with the upper end of the stop member 66. A machine of this general type equipped with such an impression regulating means as herein described, may be used for all grades of work and is, therefore, practically universal. The adjustment is quickly made as the adjusting means is always accessible to the operator and is of such a nature that widely varying or relatively slight changes in the stock compressing force may be read ily secured.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is l. A machine of the class described having, in combination, a rotary hammer having a plurality of striking members, a leather working tool, a reciprocatory carrier for the tool arranged to be moved to proj ect into the path of movement of said members by the pressure of the work against the tool, means normally tending to move said carrier from the path of movement of said striking members and to position its tool normally to engage with the work surface, and a stationary stop member positioned to engage with said carrier to limit the degree to which the carrier may be projected into the path of movement of said hammer striking members.

2. A machine of the class described having in combination, a rotary hammer with a plurality of striking members, a leather working tool, a reciprocatory carrier for the tool arranged to be moved to project into the path of rotation of said striking members by the pressure of the work against the tool and to receive successive percussive impulses from said members, a stationary stop member positioned in the path of hammer engaging movement of said carrier to engage the carrier and limit the extent of such movement, and means for adjusting said stop member relatively to the carrier to vary the degree to which the carrier may be projected into the path of rotation of said hammer.

3. A machine of the class described having in combination, a rotary hammer with a plurality of striking members, a leather working tool, a reciprocatory carrier for the tool arranged to be moved to project into the path of rotation of said striking members by the pressure of the work against the tool and to receive successive percussive impulses from said members, said carrier having an elongated slot therein extending in the direction of its reciprocating movement, a stop member positioned within the slot in said carrier and arranged to engage the carrier at one end of said slot when the carrier is projected into the path of rotation of said hammer and means for varying the position of the contact face of said stop relatively to the end of the carrier slot to vary the degree of projection of said carrier into the path of hammer rotation.

4. In a machine of the class described, a rotatable hammer, a leather working tool, a

carrier for the tool reciprocable into the path of rotation of the hammer when the tool is acting upon stock, a stock support, means normally tending tomove the carrier from the path of rotation of the hammer and toward the support to engage its tool with the stock, and a stop member cooperating with the carrier to limit the movement of the carrier both toward and from the hammer, with means for adjusting the position of the stop member relatively to the carrier.

5. In a. nurling machine, a rotatable hammer, a nnrling tool, a carrier for the tool reciprocable into the path of rotation of the hammer when the tool is acting upon the stock, means yieldingly supporting the stock in engagement with the tool, means normally tending to hold the tool against said stock, the tool carrier having a slot therein elongated in the direction of movement of the carrier toward the hammer, a stop member mounted within the slot of said carrier having one end positioned in the line of reciprocation of the carrier tolimit the degree of projection of the carrier into the path of hammer rotation, and means for adjusting the said end of the stop relatively to the engaged portion of the carrier tovary said'degree of projection.

6. In a nurling machine, a rotatable hammer, a nurling tool, a carrier for said tool arranged to be moved into the path of rotation of the hammer when the tool is engaged by the stock, means for supporting the stock yieldingly in engagement With the tool, a spring normally tending to hold yieldingly the tool in contact with the stock, the carrier for said tool having a slot therein elongated in the direction of movement of the carrier toward the hammer, an eccentric mounted within said slot, a stop member carried by the eccentric with one end positioned adjacent one end of the slot to engage the carrier and limit the degree to which it may be projected into the path of rotation of the hammer, and means for adjusting the eccentric to vary the position of the end of the stop relatively to the end of the carrier slot.

In testimony whereof I have signed my name to this specification.

LOUISA. OASGRAIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G. 

